time, lock out heating and monitor dis- charge air temperature from the CRAH units into the IT equipment.


 Variable speed drives were added to reduce CRAH fan speed to 60 percent.


 Room temperature and humidity set points were increased to the latest rec- ommendations by the American Society of Heating, Refrigerating and Air-Condi- tioning Engineers, Atlanta. After these upgrades, the energy use of


GRAPHS: HAWKEYE ENERGY SOLUTIONS


STEP 3: Cooling System Upgrades The third step in the energy-efficiency plan addressed the data-center cooling systems and controls. Hawkeye Energy Solutions’ engineers used data from the monitoring system to provide an extremely accurate cooling load analysis. The system data showed the actual space’s cooling load was much lower than the existing cooling equip- ment capacity. These findings resulted in the following changes to the cooling system:  Upgraded controls were added to rotate three of 10 units into service at any given


the CRAH units was reduced by more than 85 percent. Chilled-water use dropped by more than 60 percent. The Data Center Energy Reduction Graph, top left, shows the energy savings in real-time using the monitoring system. The data demonstrated to ComEd that the efficiency upgrades were working and also validated the incen- tive payout.


STEP 4: UPS System Efficiency Upgrades The fourth and final step addressed the inefficiency of the two existing UPS systems. One system served the data center and the other served the IT closets on 27 occupied


BEFORE: Your current rim device


AFTER: Detex retrofit rim device


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